Actisense PRO-MUX-2 Intelligent NMEA 0183 Multiplexer
July 10, 2025
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PRO-BUF-2 Intelligent Type Approved NMEA Buffer
Two OPTO-isolated inputs and twelve ISO-Drive™isolated outputs. Offering device protection and excellent flexibility, all in one product.
Introducing the Actisense® PRO-BUF-2, the intelligent, type-approved PRO range buffer.
The PRO-BUF-2 is rugged, with a stainless steel housing, and provides isolation on all inputs and outputs. With two NMEA 0183 inputs, twelve NMEA 0183 outputs, a bi-directional serial port and an Ethernet port, the PRO-BUF-2 is a perfect solution for larger leisure vessels, commercial shipping and is a great addition for systems that require type-approved devices.
The PRO-BUF-2 is designed to suit the majority of NMEA 0183 systems and ready to go ‘out of the box’ by simply hard-wiring the two-mode inputs as required.
Stock: available
Available on backorder
Actisense PRO-BUF-2 Intelligent NMEA 0183 Buffer & Router
The Actisense PRO-BUF-2 is a commercial-grade, type-approved NMEA 0183 buffer designed to distribute navigation data across complex marine networks. Featuring 2 Opto-Isolated inputs and 12 ISO-Drive outputs, the Actisense PRO-BUF-2 reliably routes critical instrument signals—such as GPS, ECDIS, radar, and heading sensor feeds—to multiple listening devices while eliminating ground loops and current drive issues.
Engineered with an integrated Ethernet port, this buffer features a web-based configuration tool accessible from any browser for advanced data filtering, routing, sentence blocking, and real-time bandwidth monitoring. Housed in a durable 316 stainless steel enclosure with RINA Type Approval, it offers flexible mounting via bulkhead or standard DIN rail setups.
Key Features of the Actisense PRO-BUF-2
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2 Opto-Isolated Inputs & 12 ISO-Drive Outputs: Galvanic isolation up to 1000V protects connected equipment from electrical interference and ground loops
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Web-Based Configuration Tool: Fine-tune sentence filtering, routing, and input/output baud rates (up to 38,400 bps) over a standard Ethernet network connection
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Integrated Ethernet & Serial Connectivity: Stream NMEA 0183 data via TCP/IP or UDP protocols while performing remote diagnostics and firmware upgrades
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Dual Autoswitching Modules: Features virtual auto-switch modes to automatically select primary and secondary data sources (such as backup GPS units)
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Programmable Alarm Relay: Includes Normally Open (N/O) and Normally Closed (N/C) dry contact outputs compatible with onboard vessel alarm systems
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RINA Type Approved: Certified under IEC 60945 for installation on commercial vessels governed by Class Society Rules
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Rugged Stainless Steel Housing: Built with a 316 stainless steel casing and 2-part pluggable screw terminals for fast field replacement
Technical Specifications
| Specification | Value / Detail |
| Brand / Manufacturer | Actisense® |
| Model / Part Number | Actisense PRO-BUF-2 |
| Supply Voltage Range | 9V to 35V DC |
| Current Consumption | 325 mA max @ 12V DC |
| Input Ports | 2 × Opto-Isolated NMEA 0183 Listeners (1000V isolated) |
| Output Ports | 12 × ISO-Drive NMEA 0183 Talkers (1000V isolated) |
| Baud Rate Range | 4,800 to 38,400 bps (Automated matching) |
| Ethernet Port | 10/100BaseT RJ45 (TCP/IP and UDP streaming) |
| Alarm Output | Relay contacts (Common, N/O, N/C rated 35VAC / 50VDC) |
| Enclosure Material | 316 Stainless Steel (IP40 Rated) |
| Certifications / Approvals | RINA Type Approved, IEC 60945:2002-08, IACS UR E10 |
| Operating Temperature | -25°C to +70°C |
| Dimensions (W × H × D) | 210 mm × 128 mm × 27 mm |
| Weight | 530 g |
Package Contents
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1 × Actisense PRO-BUF-2 NMEA 0183 Buffer Unit
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Pluggable 2-part Screw Terminal Blocks
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DIN Rail Mount Bracket Kit
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Installation & Technical User Manual